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Publications [#60610] of David J. Brady

Papers Published

1. Brady, D.J. and Jimenez, J.L., The quantum dot spectrometer, 1999 Digest of the LEOS Summer Topical Meetings: Nanostructures and Quantum Dots/WDM Components/VCSELs and Microcavaties/RF Photonics for CATV and HFC Systems (Cat. No.99TH8455) (1999), pp. 3 - 4, San Diego, CA, USA [LEOSST.1999.794631]
   (last updated on 2007/04/11)

   Abstract:
   We describe the simulations and experiments on an electrically-tunable spectrally-sensitive photodetector based on inhomogeneous absorption in a self-assembled quantum dot array and resonant tunneling through a coupled quantum well layer. The basic structure of our device, the quantum dot spectrometer (QDS) is given. The key components are the quantum dot layer, which produces spectrally sensitive absorption and the coupling layer, which reads out spectral information as a function of the applied voltage, V. The coupling layer consists of a pair of coupled quantum wells. For certain applied bias voltages across the quantum wells, resonant transfer from the quantum dot layer to the collector layer occurs. We have constructed a preliminary device based on these concepts using the InAs-GaAs-AlAs material system

   Keywords:
   aluminium compounds;gallium arsenide;III-V semiconductors;indium compounds;infrared spectrometers;optical arrays;photodetectors;quantum well devices;resonant tunnelling devices;self-assembly;semiconductor heterojunctions;semiconductor quantum dots;